Billing issues for interrnational calls

ONGOING issues with billing for UK calls. 1) Phoned my brother in UK for his birthday — first call was unanswered but we were charged R95.71! The call didn't even connect! 2) We made a second call an hour later and spoke for 4min 19seconds — we were billed R478.55! (Heaven's knows how this amount is possible since the previous year the birthday call to the same number was R4.38 for a five minute call, inclusive of VAT for the full time!) 3) We phoned Telkom directory (phoned 1093) who quoted international billing as R9.66 per minute to mobile phones and R3.59 per minute to landline. No response to the email sent regarding this. After at LEAST 30 emails and phone calls there is still no resolution. We have asked to speak to a senior manager without success. HELP!!!!